package com.example.nightmeel;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.ListFragment;
import android.app.LoaderManager;
import android.content.Loader;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.example.nightmeel.db.TimeLineData;
import com.example.nightmeel.db.TimeLineDbDao;
import com.example.nightmeel.db.TimeLineDbHelper;
import com.example.nightmeel.dummy.ContentsAdapter;
import com.example.nightmeel.loader.TimeLineLoader;
import com.example.nightmeel.loader.TimeLineLoaderCallbacks;

/**
 *
 */
public class ItemListFragment extends ListFragment {

    /**
     * The serialization (saved instance state) Bundle key representing the
     * activated item position. Only used on tablets.
     */
    private static final String STATE_ACTIVATED_POSITION = "activated_position";

    /**
     * The fragment's current callback object, which is notified of list item
     * clicks.
     */
    private Callbacks mCallbacks = sDummyCallbacks;

    /**
     * The current activated item position. Only used on tablets.
     */
    private int mActivatedPosition = ListView.INVALID_POSITION;

    /**
     * ローダー関連.
     */
   private LoaderManager mLoaderManager = null;
   private final static int LOADER_ID_TIMELINE_LIST = 0;
   private static boolean mTimeLineListInitFlag = false;
   TimeLineLoader mTimeLineLoader = null;

    /**
     * A callback interface that all activities containing this fragment must
     * implement. This mechanism allows activities to be notified of item
     * selections.
     */
    public interface Callbacks {
        /**
         * Callback for when an item has been selected.
         */
        public void onItemSelected(int id);
    }

    /**
     * A dummy implementation of the {@link Callbacks} interface that does
     * nothing. Used only when this fragment is not attached to an activity.
     */
    private static Callbacks sDummyCallbacks = new Callbacks() {
        @Override
        public void onItemSelected(int id) {
        }
    };

    private ContentsAdapter mContentsAdapter = null;
    private ArrayList<TimeLineData> mValueObjectList = null;

    private SQLiteDatabase mReadable;

    private static final String tag = ItemListFragment.class.getSimpleName();

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public ItemListFragment() {
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException(
                    "Activity must implement fragment's callbacks.");
        }
        mCallbacks = (Callbacks) activity;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setLoader();
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Restore the previously serialized activated item position.
        if (savedInstanceState != null
                && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
            setActivatedPosition(savedInstanceState
                    .getInt(STATE_ACTIVATED_POSITION));
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        getListView().smoothScrollBy(3000, 1000*60);

        makePublicTimeLine();
    }

    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = sDummyCallbacks;
    }

    @Override
    public void onListItemClick(ListView listView, View view, int position, long id) {
        super.onListItemClick(listView, view, position, id);
        TimeLineData object = (TimeLineData)listView.getAdapter().getItem(position);
        int rowId = object.getRowid();

        // Notify the active callbacks interface (the activity, if the
        // fragment is attached to one) that an item has been selected.
        mCallbacks.onItemSelected(rowId);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mActivatedPosition != ListView.INVALID_POSITION) {
            // Serialize and persist the activated item position.
            outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
        }
    }

    /**
     * Turns on activate-on-click mode. When this mode is on, list items will be
     * given the 'activated' state when touched.
     */
    public void setActivateOnItemClick(boolean activateOnItemClick) {
        // When setting CHOICE_MODE_SINGLE, ListView will automatically
        // give items the 'activated' state when touched.
        getListView().setChoiceMode(
                activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
                        : ListView.CHOICE_MODE_NONE);
    }

    private void setActivatedPosition(int position) {
        if (position == ListView.INVALID_POSITION) {
            getListView().setItemChecked(mActivatedPosition, false);
        } else {
            getListView().setItemChecked(position, true);
        }

        mActivatedPosition = position;
    }

    private void makeDummy () {
        mValueObjectList.add(getValueObject(1));
        mValueObjectList.add(getValueObject(1));
        mValueObjectList.add(getValueObject(2));
    }

    private TimeLineData getValueObject(int size) {
        TimeLineData retObject = new TimeLineData();
        retObject.setImage_size(size);

        return retObject;
    }

    /**
     * パブリックタイムラインを読み込む.
     * 起動時に呼ばれる.
     */
    public void makePublicTimeLine() {
        Log.d(tag, "makePublicTimeLine is start.");

        // まだinitLoader()してない場合
        if (!mTimeLineListInitFlag) {
            mLoaderManager.initLoader(LOADER_ID_TIMELINE_LIST, null, mTimeLineLoaderCallbacks);
            mTimeLineListInitFlag = true;
        } else {
            mLoaderManager.restartLoader(LOADER_ID_TIMELINE_LIST, null, mTimeLineLoaderCallbacks);
        }
        Log.d(tag, "makePublicTimeLine is end.");
    }

    /** Loader系の処理 **/

    /**
     * 起動時にコンテンツを取得するLoader.
     */
    private TimeLineLoader.EventListener mTimeLineLoaderListener = new TimeLineLoader.EventListener() {

        @Override
        public List<TimeLineData> loadInBackground() {
            Log.d(tag, "mTimeLineLoaderListener#loadInBackground is start.");

            TimeLineDbHelper helper = new TimeLineDbHelper(getActivity());
            mReadable = helper.getReadableDatabase();
            TimeLineDbDao dao = new TimeLineDbDao(mReadable);

            mValueObjectList = (ArrayList<TimeLineData>) dao.selectAll();
            Log.d(tag, "all size is " + mValueObjectList.size());

            // データがない場合はダミーを入れる
            if (mValueObjectList.size() == 0) {
                //makeDummy();
            }

            mContentsAdapter = new ContentsAdapter(getActivity(), R.layout.list_contents, mValueObjectList);

            return null;
        }
    };

    /**
     * ローダーを初期化する.
     */
    private void setLoader () {
        mLoaderManager = getLoaderManager();
        mTimeLineLoaderCallbacks = new TimeLineLoaderCallbacks(mTimeLineLoaderCallbacksListener);

        makePublicTimeLine();
    }

    /**
     * TimeLineLoaderのコールバック.
     */
    private TimeLineLoaderCallbacks mTimeLineLoaderCallbacks = null;

    /**
     * TodoLoaderのイベントリスナ.
     */
    private TimeLineLoaderCallbacks.EventListener mTimeLineLoaderCallbacksListener = new TimeLineLoaderCallbacks.EventListener() {

        /**
         * Loaderを初期化した時に呼ばれる.
         */
        @Override
        public Loader<List<TimeLineData>> onCreateLoader(int arg0, Bundle arg1) {
            Log.d(tag, "TimeLineLoaderCallbacks.EventListener#onCreateLoader()");
            mTimeLineLoader = new TimeLineLoader(getActivity(), mTimeLineLoaderListener);
            mTimeLineLoader.forceLoad();
            return mTimeLineLoader;
        }

        /**
         * データ読み込みが完了した時に呼ばれる.
         */
        @Override
        public void onLoadFinished(Loader<List<TimeLineData>> loader, List<TimeLineData> list) {
            Log.d(tag, "TimeLineLoaderCallbacks.EventListener#onLoadFinished()");
            // listviewにadapterをセット.
            setListAdapter(mContentsAdapter);
        }

        @Override
        public void onLoaderReset(Loader<List<TimeLineData>> arg0) {
            Log.d(tag, "TimeLineLoaderCallbacks.EventListener#onLoaderReset()");
        }

    };

}
